From 3728f03af34301a16a5f4f452caac10f48099628 Mon Sep 17 00:00:00 2001
From: Daniil Gentili <daniil.gentili.dg@gmail.com>
Date: Sun, 1 Jan 2017 12:31:24 +0000
Subject: [PATCH] Added file id permutator

---
 id.php | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 id.php

diff --git a/id.php b/id.php
new file mode 100644
index 00000000..317414d5
--- /dev/null
+++ b/id.php
@@ -0,0 +1,36 @@
+<?php
+/*
+Copyright 2016 Daniil Gentili
+(https://daniil.it)
+This file is part of MadelineProto.
+MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU Affero General Public License for more details.
+You should have received a copy of the GNU General Public License along with MadelineProto.
+If not, see <http://www.gnu.org/licenses/>.
+*/
+
+require 'vendor/autoload.php';
+
+$id = "AgADBAADcKoxG4_aCgYKET2oLMua7pxRaRkABKoeLWY9bpazGdcCAAEC";
+
+function foreach_offset_length($string, $callback) {
+    $strlen = strlen($string);
+    for ($offset = 0; $offset < strlen($string); $offset++) {
+        for ($length = $strlen - $offset; $length > 0; $length--) {
+            $s = substr($string, $offset, $length);
+            echo 'Offset: '.$offset.', length: '.$length.', res: ';
+            $callback($s);
+        }
+    }
+}
+
+$base256 = base64url_decode($id);
+foreach_offset_length($base256, function ($s) {
+    $int = (string)(new \phpseclib\Math\BigInteger(strrev($s), 256));
+    echo $int.PHP_EOL;
+});
+
+function base64url_decode($data) {
+  return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
+}